超高压变电站接地引线电流特性测试研究  

Test and Research on the Characteristics of Grounding Lines Current in Extra High Voltage Substation

作　　者：李爽[1] 吴细毛[1] 李斌[1] 唐佳能 高立群[2] 

机构地区：[1]国网辽宁省电力有限公司电力科学研究院,沈阳110006 [2]中国科学院金属研究所,沈阳110016

出　　处：《高压电器》2017年第5期127-131,140,共6页High Voltage Apparatus

摘　　要：为了掌握超高压变电站设备接地线入地电流的实际情况,为下一步做入地电流对地网金属材料的腐蚀研究提供数据依据,笔者选取了东北地区5个超高压变电站,从理论上分析了组合电器和敞开式设备接地线入地电流产生的原因,利用霍尔效应原理对变电站内设备接地引线上的电流情况进行了测试研究。研究表明,带金属外壳设备(如HGIS、GIS、罐式断路器等)接地线上的电流比瓷柱敞开式设备的要大得多,且为工频电流;电流的大小与多种因素有关,如土壤特性、负荷电流大小、变电站布置方式、接地线连接情况、外部干扰等;550 kV HGIS设备接地线上电流的大小与负荷电流呈正相关关系,其值大小与接地线的编号呈振荡波形状;敞开式设备接地线上电流的大小与负荷电流的大小并无明显关系。252 kV GIS在出线套管处的入地电流最大,三相中B相最小,最大实测可达100 A,其余部位电流很小。To identify the applical condition of grounding lines current of EHV substation appliances and supply the testing data for the research on the coron of current to grounding grid, the five EHV substations in southeast were selectied. The resean of grounding lines current of HGIS （GIS）and air insulated appliances was analyzed and the currents were measured by huoer theory. The results demonstrated that the currents in the appliances grounding lines with enclosure （for example, HGIS, GIS, tank type circuit breaker） were more larger than those in the air insulated appliances grounding lines,whose frequency was 50 Hz. There were many factors on the am- plitude of the current in grounding line, such as soil characteristics, load current, substation layout, grounding line connection, external interference, etc. There existed a positive correlation relationship between the grounding line current and load current of 550 kV HGES,and the oscillatory wave relationship was found between the currents and grounding line numbers. However, this relationship had nothing to do with air insulated appliances grounding lines.The cur-rents in outlet bushings of 252 kV GIS were the maximum, and the least one was phase B which was approach to 100 A. The currents at other position were very small.

关 键 词：接地线电流 HGIS(GIS) 敞开式设备 负荷电流 地网腐蚀 

分 类 号：TM63[电气工程—电力系统及自动化]